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An article in the May number of “Harpers’ Magazine” presents drawings of a very simple arrangement by which any house can be made thoroughly self-ventilating. Ventilation, as this article shows, consists in two things,–a perfect and certain expulsion from the dwelling of all foul air breathed from the lungs or arising from any other cause, and the constant supply of pure air.

One source of foul air cannot be too much guarded against,–we mean imperfect gas-pipes. A want of thoroughness in execution is the sin of our American artisans, and very few gas-fixtures are so thoroughly made that more or less gas does not escape and mingle with the air of the dwelling. There are parlors where plants cannot be made to live, because the gas kills them; and yet their occupants do not seem to reflect that an air in which a plant cannot live must be dangerous for a human being. The very clemency and long-suffering of Nature to those who persistently violate her laws is one great cause why men are, physically speaking, such sinners as they are. If foul air poisoned at once and completely, we should have well-ventilated houses, whatever else we failed to have. But because people can go on for weeks, months, and years breathing poisons, and slowly and imperceptibly lowering the tone of their vital powers, and yet be what they call “pretty well, I thank you,” sermons on ventilation and fresh air go by them as an idle song. “I don’t see but we are well enough, and we never took much pains about these things. There’s air enough gets into houses, of course. What with doors opening and windows occasionally lifted, the air of houses is generally good enough;”–and so the matter is dismissed.

One of Heaven’s great hygienic teachers is now abroad in the world, giving lessons on health to the children of men. The cholera is like the angel whom God threatened to send as leader to the rebellious Israelites. “Beware of him, obey his voice, and provoke him not; for he will not pardon your transgressions.” The advent of this fearful messenger seems really to be made necessary by the contempt with which men treat the physical laws of their being. What else could have purified the dark places of New York? What a wiping-up and reforming and cleansing is going before him through the country! At last we find that Nature is in earnest, and that her laws cannot be always ignored with impunity. Poisoned air is recognized at last as an evil,–even although the poison cannot be weighed, measured, or tasted; and if all the precautions that men are now willing to take could be made perpetual, the alarm would be a blessing to the world.

Like the principles of spiritual religion, the principles of physical religion are few and easy to be understood. An old medical apothegm personifies the hygienic forces as the Doctors Air, Diet, Exercise, and Quiet: and these four will be found, on reflection, to cover the whole ground of what is required to preserve human health. A human being whose lungs have always been nourished by pure air, whose stomach has been fed only by appropriate food, whose muscles have been systematically trained by appropriate exercises, and whose mind is kept tranquil by faith in God and a good conscience, has perfect physical religion. There is a line where physical religion must necessarily overlap spiritual religion and rest upon it. No human being can be assured of perfect health, through all the strain and wear and tear of such cares and such perplexities as life brings, without the rest of faith in God. An unsubmissive, unconfiding, unresigned soul will make vain the best hygienic treatment; and, on the contrary, the most saintly religious resolution and purpose may be defeated and vitiated by an habitual ignorance and disregard of the laws of the physical system.